en.javascript.info/1-js/04-object-basics/01-object/8-multiply-numeric/task.md

importance: 3

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Multiply numeric properties by 2

Create a function multiplyNumeric(obj) that multiplies all numeric properties of obj by 2.

For instance:

// before the call
let menu = {
  width: 200,
  height: 300,
  title: "My menu"
};

multiplyNumeric(menu);

// after the call
menu = {
  width: 400,
  height: 600,
  title: "My menu"
};

Please note that multiplyNumeric does not need to return anything. It should modify the object in-place.

P.S. Use typeof to check for a number here.